FMX
files are the Fire Monkey Equivalent of Delphi's VCL DFM form files in that they
determine the layout and properties of the objects added to the form at design
time.
If you are starting a Fire Monkey Form from scratch you will
probably never be interested in the contents of the FMX file but if you have a
VCL form code which you wish to port to a Fire Monkey application it is nice to
take as much of the code as possible across and ideally this includes the form
layout. Because Fire Monkey visual objects and their properties are very similar
in name to the equivalent VCL components a lot can be automatically ported.